EE WAS DESCENDING THE STAIRS OF THE 4BELT/2BELT TRANSFER STATION & AS HE NEARED THE GROUND HE LET LOOSE OF THE HANDRAIL. AS HE STEPPED ON THE 2ND STEP FROM THE BOTTOM A WELD FAILED & ONE SIDE OF THE STEP DROPPED 4"" CAUSING HIM TO LOSE HIS BALANCE & FALL APPROX 12"" TO THE GROUND